Use for the biological control of whitefly eggs and larvae. Easy to hang sachets can be placed directly on plants and will steadily release predators that actively seek out or await passing prey. Each sachet contains 250 Amblyseius swirskii predators and can be used preventatively and at the first signs of pest's presence. Whitefly killer can be used in combination with Encarsia formosa parasitic wasps to help further control whitefly pest populations. Only apply if temperatures in the growing environment are above 20 degrees Celsius and avoid placing sachets in direct sunlight.